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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b26f869e3276073eae988881e97a56f08ab54c6cf2563df8f49ae86a56b7af' 
  AND token = '2MnnlTZL6QYfmkFM7+3mEry+dGdG+4TyxXVMHAkx1hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}